Umbrella



FIG. 1 is a front perspective view of the umbrella of the present invention;

FIG. 2 is a front view of the umbrella of the present invention;

FIG. 3 is a rear view of the umbrella of the present invention;

FIG. 4 is a right side view of the umbrella of the present invention;

FIG. 5 is a left side view of the umbrella of the present invention;

FIG. 6 is a top view of the umbrella of the present invention; and,

FIG. 7 is a bottom view of the umbrella of the present invention.

The broken lines in FIG. 7 are to show that the interior portions of the umbrella form no part of the claimed design. 

The ornamental design for an umbrella, as shown and described. 